Please ask her to maintain good sleep hygiene.
1.Set and maintain regular sleep and wake up time
2.Avoid afternoon naps.
3.Avoid drinking tea /coffee close to bedtime.
4.Exercise 20-30 minutes a day
5.A warm bath , reading ( not digital media), soft music helps.
6.Keep bedroom comfortable and dark while sleeping
Avoid excessive time in bed.
Health Tips
Avoid anxiety, deal stressors. Wish your wife good health.